Question about 1997 Cadillac DeVille

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When driving the cooling temp stays about around 197, but when i stop at a light, and go the temp, go up to about 222 and sometimes 230, and once the light turns green and you drive for awhile it goes back down to 197.

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Sounds like like your radiator fan is not turning on when it should.Check fan relay,fan fuse and check for 12 volts at fan motor at connector.If all checks out then fan motor is most likely bad.

Posted on Apr 09, 2011

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  • Master
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Get the coolant checked. The engine coolant may have air trapped in it. Normal temp should be 195 to 215. Fans do not come on high speed until 225.

Posted on Apr 09, 2011

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My 2008 hhr ss temperature goes from 196 to 210 on the road. Can I drive 1001 miles? While driving the coolant system goes down and then goes up when it's parked. Is it good or bad idea?


I'm fairly sure what you described is normal operation.
The thermostat opens at 195-197 degrees and the radiator fan kicks on around 225 degrees. So the normal range is between those numbers. And the coolant tank would rise when you turn the engine off because it stops flowing.
As long as the temp stays under 220 and you are not losing coolant you should be ok.

Apr 04, 2016 | Cars & Trucks

3 Answers

That engine normally operates around 220 degrees,if it goes above that the cooling fan engages and runs momentarily until the engines cools down. My problem is the fans are not kicking on at this point....


When was the last time you change the thermostat and do a coolant flush?
The regular schedule is every 2 years or 24,000 miles.

Do not drive the car because over heat can warp the Northstar V8 aluminum head and blow the headgasket.
Do the thermostat change + flush and fill ASAP.

Jul 28, 2011 | 1999 Cadillac DeVille

1 Answer

While driving my car my temperture goes up while in idle or just driving around town but not on major highway, or if traffic stops. The set temp for the car is 197 but something it goes up tp 230 and...


YOU MAY HAVE A CLOGGED RADIATOR! EXTERNALLY! YOU MAY NEED TO REMOVE IT, AND PRESSURE WASH THE FINS! WHEN THEY GET CLOGGED WITH DIRT, THEY CAN CAUSE THIS!

Feb 28, 2011 | 1999 Cadillac DeVille

1 Answer

Temperature stays consistant while driving but


That does not seem too abnormal to me. I believe you have a 195 degree F thermostat, so you should probably be a bit cooler than 230 that is for sure. You have got an engine temperature sensor, should be located on cooling port on intake, you have a coolant temperature sensor on rad. Have you put in a new thermostat?

Jul 09, 2010 | 2006 Chevrolet Silverado

2 Answers

I have a 1999 Cadilac Deville that I replaced a


Are you sure the thermostat was in the wrong way ?.

The thermostat is located in the bottom hose unlike most conventional cooling systems.

The thermostat in the Northstar engine is a dual action device.
One end of the stem is the Thermostat(obviously) and at the other end is a spring loaded pressure valve(the thinner end).

Make sure the thermostat end is nearest the rubber hose and the pressure valve end is in towards the engine.

Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.

For overheating problems consider the following......

The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

Jun 30, 2010 | 1999 Cadillac DeVille

2 Answers

What coolant temp should i have, while driving temp gets to 222 f. is this normal?


222 is quite normal for the Northstar engine.
The cooling fans don't come on until around 225 degrees unless of course you have the air con on.

Oct 03, 2009 | 1998 Cadillac DeVille

2 Answers

98 cad deville is running at 210 degrees


Reverse flush the cooling system and put in fresh antifreeze to -20. (20 below zero). If that doesn't help, replace the thermostat.

Mar 18, 2009 | 1998 Cadillac DeVille

1 Answer

Cooling fan problem


The electric fans on some vehicles dont stay on all the time. If the radiator is not burningyou then i would suspect the guage is bad. The engine would throw a code if the fan was not working properly, so im pretty sure that your fan is working properly. I hope that helps you out.

Nov 21, 2008 | 2005 Chevrolet Impala

1 Answer

Water pipe


Repair the pipe, fill and bleed the air from cooling system (consault factory repair manual for procedure) and recheck electric cooling fan, you are aware the fan only runs when the engine temp. reaches a a certain temp. useually around 230 deg F It will also run if the AC is on, but it will not run all the time.

Jul 22, 2008 | 1997 BMW 328

1 Answer

Coolant temp. raising. no coolant loss.


first with the car off and cool squeeze bottom radiator hose with your hand then do the top,this burps any air out of the system,of course have the cap open,if this doesnt solve the problem its your radiator cores are block as you speed up its trying to force coolant thru a blocked core and temperature rises,you can pull your raidiator and have it cored at a radiator shop,cheeper than buying new

Jul 07, 2008 | 1999 Cadillac DeVille

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